Home / 20,998.20-31,454.10-10,615.80

Finding the Fourth Proportional to 20,998.20, 31,454.10 and 10,615.80

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Solution

The fourth proportional to 20,998.20, 31,454.10 and 10,615.80 is: 15,901.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,998.20 : 31,454.10 = 10,615.80 : x
  2. Step 2: Convert to fraction form
    20,998.20/31,454.10 = 10,615.80/x
  3. Step 3: Cross multiply
    20,998.20x = 31,454.10 × 10,615.80
  4. Step 4: Simplify right side
    20,998.20x = 333,910,434.78
  5. Step 5: Solve for x
    x = 333,910,434.78/20,998.20
  6. Step 6: Final answer
    x = 15,901.86

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.